CN110295628A - A kind of pavement construction method with inspection shaft - Google Patents
A kind of pavement construction method with inspection shaft Download PDFInfo
- Publication number
- CN110295628A CN110295628A CN201910588408.8A CN201910588408A CN110295628A CN 110295628 A CN110295628 A CN 110295628A CN 201910588408 A CN201910588408 A CN 201910588408A CN 110295628 A CN110295628 A CN 110295628A
- Authority
- CN
- China
- Prior art keywords
- inspection shaft
- well
- walling crib
- construction method
- pavement construction
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C11/00—Details of pavings
- E01C11/005—Methods or materials for repairing pavings
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/12—Manhole shafts; Other inspection or access chambers; Accessories therefor
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/12—Manhole shafts; Other inspection or access chambers; Accessories therefor
- E02D29/125—Manhole shafts; Other inspection or access chambers; Accessories therefor characterised by the lining of the shaft
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/12—Manhole shafts; Other inspection or access chambers; Accessories therefor
- E02D29/128—Repairs of manhole shafts
Abstract
The present invention relates to a kind of pavement construction methods with inspection shaft, comprising the following steps: step 1: excavating groove according to design requirement, and carries out Pipe installing, is backfilling and compacted；Step 2: the well bore of inspection shaft is built；Step 3: the backfill of well bore surrounding expects backfill by upright ramming machine to carry out compaction in layers；Step 4: laying road underlayment and sub-surface；Step 5: excavating the road subbase course and sub-surface in well week, is forming holding tank well week, is placing walling crib reinforcing bar in holding tank, carry out concreting to walling crib reinforcing bar, form the walling crib of monolithic reinforced concrete structure；Step 6: pavement asphalt construction is carried out, and well lid is installed.The case where present invention effectively improves the compaction of filler around inspection shaft, reduces the sedimentation of inspection shaft neighboring area.
Description
Technical field
The present invention relates to technical field of road construction, more particularly, to a kind of pavement construction method with inspection shaft.
Background technique
Inspection shaft be the power supply for Urban Underground infrastructure, water supply, draining, blowdown, communication, cable television, gas pipe,
Public lighting circuit etc. maintenance, it is easy for installation and be arranged, be generally located at pipeline intersection, turning, caliber or gradient change, with
And locate at a certain distance on straight line pipeline section, it is easy for inspecting periodically auxiliary construction.
In construction, it is generally first laid with pipeline, is building inspection shaft, groove is then backfilled and carries out road construction, inspection shaft
Around backfill filler material, filler material is that drought is husky, because of the presence of inspection shaft, to the compacting work of large-scale rolling apparatus, there are shadows
It rings, so that the compaction of filler material is inadequate around inspection shaft.After being open to traffic, because the compaction around inspection shaft be less than road its
The compaction in his region causes the sedimentation of inspection shaft neighboring area to be greater than the sedimentation in other regions of road, so that road is uneven,
Road is easily damaged, and is made troubles and security risk to people's trip.
Summary of the invention
The object of the present invention is to provide a kind of pavement construction methods with inspection shaft, increase inspection shaft periphery filler material
Compaction, reduce inspection shaft neighboring area sedimentation be greater than other regions of road sedimentation so that road injustice be easy damage
Bad situation.
Above-mentioned purpose of the invention has the technical scheme that
A kind of pavement construction method with inspection shaft, comprising the following steps:
Step 1: groove is excavated according to design requirement, and carries out Pipe installing, is backfilling and compacted；
Step 2: the well bore of inspection shaft is built；
Step 3: the backfill of well bore surrounding expects backfill by upright ramming machine to carry out compaction in layers；
Step 4: laying road underlayment and sub-surface；
Step 5: excavating the road subbase course and sub-surface in well week, is forming holding tank well week, is placing walling crib steel in holding tank
Muscle carries out concreting to walling crib reinforcing bar, forms the walling crib of monolithic reinforced concrete structure；
Step 6: pavement asphalt construction is carried out, and well lid is installed.
By using above-mentioned technical proposal, compaction in layers is carried out by backfill material of the upright ramming machine to well bore surrounding, gram
The influence for taking inspection shaft itself improves the compaction of filler around inspection shaft, while the walling crib of reinforced concrete structure increases
Big forced area, the case where improving support strength, and then reduce the sedimentation of inspection shaft neighboring area, and reduces inspection shaft periphery
The degree of regional subsidence.
The present invention is further arranged to: the bottom of the step 1 groove is first laid with one layer of mortar levelling layer, then in mortar
Pipe laying on screed-coat.
By using above-mentioned technical proposal, smooth groove facilitates the installation of pipeline, keeps the docking of pipeline more acurrate.
The present invention is further arranged to: when the step 2 inspection shaft is built, it is wet first to carry out watering to brick.
By using above-mentioned technical proposal, wet brick can make mortar be preferably stained with conjunction on brick face, dry brick with
Mortar be stained with when connecing, and brick can absorb the moisture in mortar, and reduce mortar is stained with resultant force.
The present invention is further arranged to: stone mar has been squeezed into the bottom of the step 3 holding tank, and stone mar is fully inserted to hold
Receive the bottom of slot, the bottom of holding tank is equipped with a level with metalling, and graded broken stone layer is tamped by upright ramming machine.
The closely knit of inspection shaft surrounding is further increased by stone mar and graded broken stone layer by using above-mentioned technical proposal
Degree and support strength.
The present invention is further arranged to: the walling crib reinforcing bar includes the first stirrup, the second stirrup and steel hoop, institute
It states the first stirrup, the second stirrup, be fixed by iron wire between steel hoop, corresponding second stirrup of the well bore
Jack, the jack inner support reinforcing bar are offered on position, the spacer bar is fixedly connected by iron wire with steel hoop.
By using above-mentioned technical proposal, spacer bar can be positioned walling crib reinforcing bar, coagulated soil compression strength height, resisted
Tensile strength is low, and the resistance to compression of reinforcing bar and tensile capacity are all very strong but at high cost, by the first stirrup, the second stirrup, steel hoop
It is combined together with concrete, takes full advantage of concrete crushing strength height, Steel Bar Tensile Strength is strong, improves the resistance to compression of walling crib
And tensile capacity.
The present invention is further arranged to: the spacer bar is equipped with hook far from one end of well bore, and the hook catches on ring
Shape reinforcing bar.
By using above-mentioned technical proposal, hook catches on the steel hoop of periphery and is fixed with iron wire, in concreting
When with tamping, reinforcing bar walling crib will not be displaced.
The present invention is further arranged to: the step 4 first sprinkles water on roadbed before laying road underlayment, allows roadbed
Keep wet.
By using above-mentioned technical proposal, rendzinas water content is uniformly and few with optimum moisture content difference when rolling, and grinds
The water content of lime stabilized soil controls between water content 1%-2% when pressure, when effectively can avoid rolling the phenomenon that peeling.
The present invention is further arranged to: when the step 6 pavement asphalt is constructed, the installation check well specially in walling crib
Pit shaft is positioned, asphalt surface course lower layer is laid on sub-surface and is rolled, positioning pit shaft is taken out, it is finally that well lid installation is in place,
It paves and asphalt surface course upper layer and rolls.
By using above-mentioned technical proposal, asphalt surface course upper layer can cover the frame of well lid, enable the frame of well lid
It is fixed on bituminous pavement well, road surface is more smooth.
In conclusion the invention has the following advantages:
1. upright ramming machine carries out compaction in layers to the backfill material of well bore surrounding, the compacting journey of filler around inspection shaft is improved
Degree is arranged by stone mar and graded broken stone layer, further increases the compaction rate and support strength of inspection shaft surrounding.
2. the walling crib of reinforced concrete structure increases forced area, support strength is improved, and then reduces inspection shaft week
The case where border region settles, and reduce the degree of inspection shaft neighboring area sedimentation.
Detailed description of the invention
Fig. 1 is structural schematic diagram of the invention；
Fig. 2 is the enlarged diagram of part A in Fig. 1.
In figure: 1, well bore；11, jack；2, road subbase course；3, sub-surface；4, holding tank；41, stone mar；42, gradation
Metalling；5, well lid；6, walling crib reinforcing bar；61, the first stirrup；62, the second stirrup；63, steel hoop；7, spacer bar；
71, hook；8, asphalt surface course lower layer；9, asphalt surface course upper layer.
Specific embodiment
Below in conjunction with attached drawing, invention is further described in detail.
Referring to Figures 1 and 2, a kind of pavement construction method with inspection shaft disclosed by the invention, comprising the following steps:
Step 1: requiring according to design drawing, ground grading, and groove is excavated in ground on the scene, and the bottom of groove is laid with one layer of mortar
Screed-coat is laid with pipe laying on screed-coat, backfills with coarse sand and to pipeline, is then compacted, and compactness is up to 95%
More than.
Step 2: before masonry, brick being watered wet, then successively build shaft bottom base concrete, and circle builds well bore 1, builds
Pipe well junction and the inside and outside powder borehole wall are built, gap blocks tight, every layer of brick setting between the nozzle and the borehole wall of inspection shaft access round tube
Masonry cement filling it is full.
Step 3: it finishes in inspection shaft masonry, after mortar sufficiently conserves, can be backfilled in 1 surrounding of well bore, by straight
Vertical ramming machine expects backfill to carry out compaction in layers.
Step 4: smooth roadbed is sprinkled water on roadbed, it is allowed to keep certain wet but not muddy.It is laid on roadbed
It with a thickness of the lime stabilized soil of 20cm, is then rolled with road roller, forms road subbase course 2.It paves in road subbase course 2
Cement stabilized soil, cement stabilized soil with a thickness of 30cm, using layered rolling, every layer of compacted thickness is no more than 15cm, cement
Sub-surface 3 is formed after the completion of roller compacted stabilized soil.
Step 5: excavating the road subbase course 2 and sub-surface 3 in well week, forms holding tank 4, the width of holding tank 4 in well week
Degree is 60cm, beats stone mar 41 in the bottom of holding tank 4, stone mar 41 submerges the bottom of holding tank 4 completely, then at the bottom of holding tank 4
Portion's layer overlay graded broken stone layer 42, graded broken stone layer 42 is tamped by upright ramming machine.Pass through punching in 1 outer wall of well bore
Tool stamps jack 11, and the depth of jack 11 is the one third of 1 thickness of well bore, positioning pit shaft is connected on well bore 1, walling crib
Reinforcing bar 6 is put into holding tank 4, and walling crib reinforcing bar 6 includes the first stirrup 61, the second stirrup 62 and steel hoop 63, the first steel
Muscle hoop 61, the second stirrup 62 are fixed between steel hoop 63 by iron wire, and steel hoop 63 and inspection shaft coaxial line are set
It sets.Spacer bar 7 is inserted into jack 11, spacer bar 7 is provided with hook 71 far from one end of well bore 1, and hook 71 catches on annular
Reinforcing bar 63, spacer bar 7 are fixedly connected by iron wire with steel hoop 63, then casting concrete, tamping, after condensation 12 hours
Positioning pit shaft is removed, forms the walling crib of reinforced concrete structure on inspection shaft.Walling crib is set to the upper surface of inspection shaft, walling crib
Inner wall is concordant with inspection shaft inner wall to be arranged.
Step 6: installation check well positions pit shaft, asphalt surface layer lower layer 8 and grinding compacting in walling crib, and it is fixed to take out
Position pit shaft, finally installs well lid 5 in place, and pave asphalt surface course upper layer 9 and grinding compacting, and well lid 5 and asphalt surface course upper layer 9 are neat
It is flat.
The implementation principle of the present embodiment are as follows: upright ramming machine is not influenced at work by inspection shaft, is utilized by worker
Upright ramming machine carries out compaction in layers to the backfill material of 1 surrounding of well bore, improves the compaction of filler around inspection shaft, accommodates
The bottom of slot 4 is provided with stone mar 41 and graded broken stone layer 42, further increases the compaction rate and support strength of inspection shaft surrounding.
Spacer bar 7 can position walling crib reinforcing bar 6, and hook 71 catches on the steel hoop 63 of periphery and fixed with iron wire, convenient
Walling crib concrete pours, and the walling crib of reinforced concrete structure increases forced area, improves support strength, and then reduce inspection
The case where neighboring area Cha Jing settles, and reduce the degree of inspection shaft neighboring area sedimentation.
The embodiment of present embodiment is presently preferred embodiments of the present invention, not limits protection of the invention according to this
Range, therefore: the equivalence changes that all structures under this invention, shape, principle are done, should all be covered by protection scope of the present invention it
It is interior.
Claims (8)
1. a kind of pavement construction method with inspection shaft, which comprises the following steps:
Step 1: groove is excavated according to design requirement, and carries out Pipe installing, is backfilling and compacted；
Step 2: the well bore (1) of inspection shaft is built；
Step 3: the backfill of well bore (1) surrounding expects backfill by upright ramming machine to carry out compaction in layers；
Step 4: laying road underlayment (2) and sub-surface (3)；
Step 5: excavating the road subbase course (2) and sub-surface (3) in well week, forms holding tank (4) in well week, holding tank (4)
Interior placement walling crib reinforcing bar (6) carries out concreting to walling crib reinforcing bar (6), forms the walling crib of monolithic reinforced concrete structure；
Step 6: pavement asphalt construction is carried out, and well lid (5) are installed.
2. a kind of pavement construction method with inspection shaft according to claim 1, it is characterised in that: the step 1 ditch
The bottom of slot is first laid with one layer of mortar levelling layer, then the pipe laying on mortar levelling layer.
3. a kind of pavement construction method with inspection shaft according to claim 1, it is characterised in that: the step 2 inspection
When looking into well and being built, it is wet that watering first is carried out to brick.
4. a kind of pavement construction method with inspection shaft according to claim 1, it is characterised in that: the step 3 is held
It receives the bottom of slot (4) and has squeezed into stone mar (41), stone mar (41) is fully inserted to the bottom of holding tank (4), the bottom of holding tank (4)
A level is equipped with metalling (42), graded broken stone layer (42) is tamped by upright ramming machine.
5. a kind of pavement construction method with inspection shaft according to claim 1, it is characterised in that: the walling crib reinforcing bar
It (6) include the first stirrup (61), the second stirrup (62) and steel hoop (63), first stirrup (61), the second steel
Muscle hoop (62), steel hoop are fixed between (63) by iron wire, the position of the well bore (1) corresponding second stirrup (62)
On offer jack (11), jack (11) the inner support reinforcing bar (7), the spacer bar (7) pass through iron wire and steel hoop
(63) it is fixedly connected.
6. a kind of pavement construction method with inspection shaft according to claim 5, it is characterised in that: the spacer bar
(7) one end far from well bore (1) is equipped with hook (71), and the hook (71) catches on steel hoop (63).
7. a kind of pavement construction method with inspection shaft according to claim 1, it is characterised in that: the step 4 exists
It before laying road underlayment (2), first sprinkles water on roadbed, roadbed is allowed to keep wet.
8. a kind of pavement construction method with inspection shaft according to claim 1, it is characterised in that: the step 6 road
When the bitumen construction of face, installation check well positions pit shaft specially in walling crib, and asphalt surface course lower layer is laid on sub-surface (3)
(8) it and rolls, takes out positioning pit shaft, finally well lid (5) are installed in place, pave and asphalt surface course upper layer (9) and roll.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910588408.8A CN110295628A (en) | 2019-07-02 | 2019-07-02 | A kind of pavement construction method with inspection shaft |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910588408.8A CN110295628A (en) | 2019-07-02 | 2019-07-02 | A kind of pavement construction method with inspection shaft |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110295628A true CN110295628A (en) | 2019-10-01 |
Family
ID=68029889
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910588408.8A Pending CN110295628A (en) | 2019-07-02 | 2019-07-02 | A kind of pavement construction method with inspection shaft |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110295628A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111827040A (en) * | 2020-07-23 | 2020-10-27 | 湖北烜豪建筑工程有限公司 | Construction process for well road with pipeline |
| CN112814033A (en) * | 2021-01-04 | 2021-05-18 | 江苏港通路桥集团有限公司 | Inspection shaft lifting construction structure |
| CN112982492A (en) * | 2021-02-06 | 2021-06-18 | 恒基建设集团有限公司 | Quick mounting structure of bituminous paving prefabricated inspection walling crib |
| CN113235661A (en) * | 2021-05-25 | 2021-08-10 | 苏州市宏益市政工程有限公司 | Inspection well structure and installation process thereof |
| CN114319445A (en) * | 2022-01-25 | 2022-04-12 | 广东广基建设集团有限公司 | Assembled inspection well and construction method thereof |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102322055A (en) * | 2011-06-29 | 2012-01-18 | 刘建华 | Construct and construction method of preventing pavement around manhole from subsiding |
| CN102644295A (en) * | 2012-04-28 | 2012-08-22 | 江苏阳湖建设项目管理有限公司 | Construction method for preventing peripheral and local sedimentation of road surface inspection well |
| CN104060630A (en) * | 2014-06-25 | 2014-09-24 | 新疆维泰开发建设（集团）股份有限公司 | Anti-displacement inspection well construction technology |
| CN204825969U (en) * | 2015-07-06 | 2015-12-02 | 河南省路嘉路桥股份有限公司 | Inspection shaft subsides prevents and treats structure |
| CN105569087A (en) * | 2016-01-13 | 2016-05-11 | 中国十九冶集团有限公司 | Construction method for inspection well |
| CN106638696A (en) * | 2016-11-01 | 2017-05-10 | 济南汇通联合市政工程有限责任公司 | Installation and construction method for anti-settling manhole cover |
| FR3061501A1 (en) * | 2017-01-05 | 2018-07-06 | Alkern Groupe | LOOK FOR CIRCULATING CHAUSSEE AND METHOD OF ADJUSTING THE HEIGHT OF SUCH A LOOK |
-
2019
- 2019-07-02 CN CN201910588408.8A patent/CN110295628A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102322055A (en) * | 2011-06-29 | 2012-01-18 | 刘建华 | Construct and construction method of preventing pavement around manhole from subsiding |
| CN102644295A (en) * | 2012-04-28 | 2012-08-22 | 江苏阳湖建设项目管理有限公司 | Construction method for preventing peripheral and local sedimentation of road surface inspection well |
| CN104060630A (en) * | 2014-06-25 | 2014-09-24 | 新疆维泰开发建设（集团）股份有限公司 | Anti-displacement inspection well construction technology |
| CN204825969U (en) * | 2015-07-06 | 2015-12-02 | 河南省路嘉路桥股份有限公司 | Inspection shaft subsides prevents and treats structure |
| CN105569087A (en) * | 2016-01-13 | 2016-05-11 | 中国十九冶集团有限公司 | Construction method for inspection well |
| CN106638696A (en) * | 2016-11-01 | 2017-05-10 | 济南汇通联合市政工程有限责任公司 | Installation and construction method for anti-settling manhole cover |
| FR3061501A1 (en) * | 2017-01-05 | 2018-07-06 | Alkern Groupe | LOOK FOR CIRCULATING CHAUSSEE AND METHOD OF ADJUSTING THE HEIGHT OF SUCH A LOOK |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111827040A (en) * | 2020-07-23 | 2020-10-27 | 湖北烜豪建筑工程有限公司 | Construction process for well road with pipeline |
| CN112814033A (en) * | 2021-01-04 | 2021-05-18 | 江苏港通路桥集团有限公司 | Inspection shaft lifting construction structure |
| CN112814033B (en) * | 2021-01-04 | 2022-04-22 | 江苏港通路桥集团有限公司 | Inspection shaft lifting construction structure |
| CN112982492A (en) * | 2021-02-06 | 2021-06-18 | 恒基建设集团有限公司 | Quick mounting structure of bituminous paving prefabricated inspection walling crib |
| CN113235661A (en) * | 2021-05-25 | 2021-08-10 | 苏州市宏益市政工程有限公司 | Inspection well structure and installation process thereof |
| CN113235661B (en) * | 2021-05-25 | 2022-05-17 | 苏州市宏益市政工程有限公司 | Inspection well structure and installation process thereof |
| CN114319445A (en) * | 2022-01-25 | 2022-04-12 | 广东广基建设集团有限公司 | Assembled inspection well and construction method thereof |
| CN114319445B (en) * | 2022-01-25 | 2024-04-09 | 广东广基建设集团有限公司 | Assembled inspection well and construction method thereof |
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Application publication date: 20191001 |